Stretchy seal cap



United States Patent O 3,17L56l STRETCHY SEAL SAP Angus Leroy Maclean, l Elizabeth St., St. Qathcrines, ntario, Canada Filed Jan. 23, 1956i, Ser. No. 339,725 3 Ciaims. (Ci. 2id-4l) This invention relates to caps for sealing beverages and the like.

lt is an object of the present invention to provide a bottle cap which will have a thin stretchable seal to aid in airtight sealing.

Another object of the present invention is to provide a bottle cap which will be made of plastic and will have a tab providing means for removing the cap from the bottle.

A further object of the present invention is to provide a bottle cap which will be reusable, providing means for resealing the bottle.

A still further object of the present invention is to provide a bottle cap which will be resilient making it possible to seal a bottle easily by snapably engaging the cap to the bottle.

Other objects of the invention are to provide a bottle cap bearing the above objects in mind which is of single construction, has a minimum number of parts, is inexpensive to manufacture and ehcient in operation and use.

For other objects and for a better understanding or" the invention, reference may be had to the following detailed description taken in conjunction with the accompanying drawing, in which:

FGURE l is a side View of the present invention shown partly broken away;

FIGURE 2 is an enlarged elvational view of the invention shown in section; and

FGURE 3 is a fragmentary bottom plan view of FIGURE 2.

Referring now more in detail to the drawing, a bottle cap il) made in accordance with the present invention is shown to include a circular plastic shell l2 having a protruding tab i4 providing means for removing cap itl when desired. A circula-r rubber diaphragm 16 is xedly secured at its edges to the rim of shell 12 and provides additional sealing means when shell 12 is placed over the neck 13 of bottle Ztl.

In use, bottle cap l0 is placed over the neck 18 of bottle Ztl and is snapped into place, thus providing an airtight seal for bottle 20.

The rim of neck 18 during the process of capping bottle 20 urges against the thin rubber diaphragm 16 and forces 3,l7l,5hl Patented Mar. Z, i965 "ice it upwardly into shell l2 and in so doing causes a displacement of air within shell i2 between the diaphragm 16 and the shell 12 and diaphragm 16 is urged downward into the neck l of bottle 20 and aids in the airtight sealing of bottle 20.

To remove bottle cap l0, a linger is placed benath tab lid and urging upon tab ld bottle cap l0 snaps off bottle 20 lt shall be noted that bottle cap 10 upon neck l of bottle 20 sevral times 16 is ruptured and making it useless.

While various changes may be made in the detail construction, it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

1. A reusable bottle cap comprising, in combination, a resilient plastic shell, a projecting tab carried by said shell providing easy removal means of said shell, a circular rubber diaphragm carried by said shell, and providing positive airtight sealing of said bottle when said cap is urged downwardly upon neck of said bottle, this urging action causing rim of said bottle to displace air contained between said diaphragm and said plastic so that said diaphragm is urged downwardly into neck of said bottle, insuring an airtight seal as said cap engages in snapping action over said neck of said bottle.

2. The combination according to claim l wherein said diaphragm engages the outer periphery of said neck of said bottle at one section and is urged by air from within said shell to inner periphery of the upper portion of the said neck of said bottle.

3. The combination according to claim 2 wherein removal means for said cap comprises said tab molded to and extending outwardly from the periphery of said shell and when urged against from beneath said tab provides means of quick and easy removal of said cap from said bottle.

may be replaced before diaphragm References Sited by the Examiner UNITED STATES PATENTS 1/35 Mead 2l5-41 4/59 Foye 21S-8 GEORGE O. RALSTON, THERON E. CONDON,

Examiners. 

1. A REUSABLE BOTTLE CAP COMPRISING, IN COMBINATION, A RESILIENT PLASTIC SHELL, A PROJECTING TAB CARRIED BY SAID SHELL PROVIDING EASY REMOVAL MEANS OF SAID SHELL, A CIRCULAR RUBBER DIAPHRAGM CARRIED BY SAID SHELL, AND PROVIDING POSITIVE AIRTIGHT SEALING OF SAID BOTTLE WHEN SAID CAP IS URGED DOWNWARDLY UPON NECK OF SAID BOTTLE, THIS URGING ACTION CAUSING RIM OF SAID BOTTLE TO DISPLACE AIR CONTAINED BETWEEN SAID DIAPHRAGM AND SAID PLASTIC SO THAT SAID DIAPHRAGM IS URGED DOWNWARDLY INTO NECK OF SAID BOTTLE, INSURING AN AIRTIGHT SEAL AS SAID CAP ENGAGES IN SNAPPING ACTION OVER SAID NECK OF SAID BOTTLE. 